Pin (a, c, e, g) and thrum (b, d, f, h) pollen grains of Primula

Different types of Primrose flowers - pin-eyed and thrum-eyed

Pin and thrum hi-res stock photography and images - Alamy

Genomic analyses of the Linum distyly supergene reveal convergent evolution at the molecular level

Comparison of pollen from pin-eyed and thrum-eyed primrose flowers, Observation, UK and Ireland

IJMS, Free Full-Text

The rapid appearance of homostyly in a cultivated distylous population of Primula forbesii - Liu - 2022 - Ecology and Evolution - Wiley Online Library

Pin-eyed and thrum-eyed, Pleach

IJMS, Free Full-Text

Pin and thrum hi-res stock photography and images - Alamy

Genomic analyses of the Linum distyly supergene reveal convergent evolution at the molecular level - ScienceDirect

Campanulaceae - an overview

Pollinators and differences in their behavior when entering the flowers

Pin (a, c, e, g) and thrum (b, d, f, h) pollen grains of Primula

Pin (a, c, e, g) and thrum (b, d, f, h) pollen grains of Primula

P. allionii measurements detected in thrum (a) and pin (b) flowers